Obama attempted to move control of the Census Bureau from the Commerce Department to the White House, to be managed by then Chief of Staff Rahm Emmanuel. 6. Obama had provided under the radar amnesty to illegal immigrants by allowing ICE Director John Morton to prohibit ICE officers from enforcing US immigration laws.
The primary enzymes responsible for DNA replication are DNA polymerases. Understanding the activity and limitations of DNA polymerases help in making sense of why DNA replication occurs the way it does. Key points are: 1  Prokaryotic cells contain three different DNA polymerases.2  Each have slightly different activities.uring DNA replication a DNA double helix must unwind and separate so that DNA polymerase enzymes can use each single strand as a template for the synthesis of a new double strand. Strand separation is catalyzed by a Helicase enzyme.
DNA polymerases cannot initiate DNA synthesis - they can only add on to an existing strand of DNA or RNA. The existing strand is said to prime DNA synthesis. RNA polymerases, however, can begin copying a parent strand with no primer - just as they do in transcription of genes. During DNA replication, RNA primers are produced by RNA polymerases in order to provide a starting point for DNA polymerases to extend from.